What chainsaw sharpener to buy?

Hi. I just bought a MS311 chainsaw and am looking for the best, most stupid-proof chainsaw sharpener.


Please send any suggestions you may have.


I have narrowed it down to two choices unless someone gives me some valuable insight.

Here are the links.

https://www.amazon.com/STIHL-EASY-C...=8-1&keywords=stihl+sharpener#customerReviews...

What chainsaw sharpener to buy?